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Finding the Fourth Proportional to 10,690.56, 15,992.10 and 8,612.91

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Solution

The fourth proportional to 10,690.56, 15,992.10 and 8,612.91 is: 12,884.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,690.56 : 15,992.10 = 8,612.91 : x
  2. Step 2: Convert to fraction form
    10,690.56/15,992.10 = 8,612.91/x
  3. Step 3: Cross multiply
    10,690.56x = 15,992.10 × 8,612.91
  4. Step 4: Simplify right side
    10,690.56x = 137,738,518.01
  5. Step 5: Solve for x
    x = 137,738,518.01/10,690.56
  6. Step 6: Final answer
    x = 12,884.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.